GGN approximation formula defined #240

Job	Run time
Tests on other platforms (windows-2019, 3.10)	4m 27s
Tests on paywalled platforms (macos-13-xlarge, 3.12)	1m 34s
Tests on other platforms (windows-2022, 3.11)	3m 48s
Tests on other platforms (windows-2022, 3.12)	4m 2s
Tests on other platforms (macos-12, 3.11)	3m 19s
Tox test (py38)	3m 26s
Tox test (py39)	3m 20s
Tox test (py310)	3m 21s
Tox test (py311)	3m 21s
Tests on other platforms (macos-13, 3.12)	4m 16s
Tox test (py312-cover)	6m 29s
Tox test (docs, graphviz)	1m 42s
Docker image	59s
PyPI packaging	0s
	44m 4s

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